On 11/12/22 04:04, And wrote:
> May I ask an important question?
> When I using mesh_camera, (for texture baking), its coverage is not sufficient
> at the edge(seams). Just like the document said:
> If used for texture baking, the generated image may have visible seams when
> applied back to the mesh, this can be mitigated. Also, depending on the way the
> original UV map was set up, using AA may produce incorrect pixels on the outside
> edge of the generated maps.
> Has this problem been solved?
I'm not aware of a general solution. I don't generate or use uv maps
much, but some ideas.
- If you are not using interpolation when reading the image map, suspect
using it might lesson the seam artifact in your case. Interpolation may
also introduce seams in other cases I think.
- For simpler shapes using the matching camera type - ie spherical
camera - to create the map images and then the same image_map mapping
will be cleaner than mesh based texture baking and uv mapping.
- What happens if you generate your map image with a higher resolution
mesh than that to which you map in the actual render? It might be too,
higher resolution image maps (denser mesh camera), help.
- IIRC, there are some suggested ways to bake map images via meshes
while doing some AA via different meshes which might help. I've never
played with the technique outlined. I suspect POV-Ray's inbuilt camera
ray AA won't be of much help.
- Scaling your uv map image up say 2x/3x in an external program will
likely mitigate the seams.
- Have you tried rendering at different output resolutions to see how
any seams might change? (Rendering large and shrinking a help?)
I have for a long time wondered how seams in the map image are handled
in the non POV-Ray cgi game. There images are typically cookie cutter
sheets for different parts of the uv mapping onto the overall mesh. Maps
I've played with 'sometimes' have visible seams too which in my
experience often do create minor artifacts...
When we read an image map we can use (pixel) interpolation - but we
perhaps should not where image maps used for uv mapping (or for any
non-continuous mapping such as images for cubic warps). The reason is
the seams cut off sharply in many uv image maps and any interpolation
will be looking at adjacent (or wrapped) pixels and not pixel adjacency
as the image is used in uv mapping on the mesh. This, I think, forces us
to higher resolution maps than might otherwise be required for smooth
It is possible with cubic warp mapped images, for example, to create the
images in a way which looks for and includes the correct adjacent pixels
at the seams so that smaller, interpolated images can be used while uv
mapping. I think I posted about some of my experiments - using user
defined cameras to create such 'interpolate-able' images. Unsure how to
do this in general. Perhaps there are too some post initial image mesh
walking AA / smoothing techniques possible, but I'm not aware of
anything like a canned program though.
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